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TECHNICAL PAPERS

Feature Variation and its Impact on Structural Acoustic Response Predictions

[+] Author and Article Information
Kenneth A. Cunefare

The George W. Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332-0405

J. Vib. Acoust 125(1), 31-38 (Jan 06, 2003) (8 pages) doi:10.1115/1.1523072 History: Received August 01, 2000; Revised August 01, 2002; Online January 06, 2003
Copyright © 2003 by ASME
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References

Kompella,  M. S., and Bernhard,  R. J., 1996, “Variation of Structural-Acoustic Characteristics of Automotive Vehicles,” Noise Control Eng. J., 44(3), pp. 93–99.
Kompella,  M. S., and Bernhard,  R. J., 1997, “Techniques for Prediction of the Statistical Variation of Multiple-Input-Multiple-Output System Response,” Noise Control Eng. J., 45(3), pp. 133–142.
Rabbiolo, G., 1998, “Definition of the Limits of Predictability of the Dynamics of Vibro-Acoustic Systems,” Ray W. Herrick Laboratories, Purdue University, Report HL 98-15.
Shepard,  W. S., and Cunefare,  K. A., 1997, “Sensitivity of Structural Acoustic Response to Attachment Feature Scales,” J. Acoust. Soc. Am., 102(3), pp. 1612–1619.
Cunefare,  K. A., and DeRosa,  S., 1999, “The Sensitivity of Structural Acoustic Response to Attachment Feature Scale Representation,” J. Acoust. Soc. Am., 106(6), pp. 3384–93.
Cunefare,  K. A., and De Rosa,  S., 1998, “An Improved State-Space Method for Coupled Fluid-Structure Interaction Analysis,” J. Acoust. Soc. Am., 105(1), pp. 206–210.
Rogers,  L. C., 1970, “Derivatives of Eigenvalues and Eigenvectors,” American Institute of Aeronautics and Astronautics, 8(5), pp. 943–945.
Meirovitch, L., 1980, Computational Methods in Structural Dynamics, Sijthoff & Noordhoff, Rockville, Maryland.

Figures

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Transfer function magnitudes for 98 SUVs, structure borne path to driver position 1, data used by permission
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Perturbation envelope. Dashed lines are the envelope, constructed from the individual perturbation curves, thin solid lines generated by Eq. (8) for a frequency variation of ±1% and a participation scale factor of unity.
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Semi-infinite plate with multiple spring-mass
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System 2, radiated power for direct solutions of reference and 98 perturbed systems (thin lines), and perturbation bounds predicted by Eq. (8) (heavy lines)
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System 2, radiated power difference for direct solutions of reference and 98 perturbed systems (thin lines), and perturbation bounds predicted by Eq. (8) (heavy lines)
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System 3, radiated power for direct solutions of reference and 98 perturbed systems (thin lines), and perturbation bounds predicted by Eq. (8) (heavy lines)
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System 3, radiated power for direct solutions of reference and 98 perturbed systems (thin lines), and perturbation bounds predicted by Eq. (3) (heavy lines), bounds are not scaled for modal participation
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System 3, radiated power difference for direct solutions of reference and 98 perturbed systems (thin lines), and perturbation bounds predicted by Eq. (8) (heavy lines)
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System 3, variation in normalized modal force for 98 perturbed systems, ⋅ normalized modal force for reference system, error bars indicate one standard deviation
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System 3, comparison of perturbation bandwidth overlap and modal overlap
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System 3, radiated power difference between reference and 98 perturbed systems per 1/3 octave band. ‘+’ are from individual runs.
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Transfer function magnitudes for 98 SUVs, airborne path to driver position 1, data used by permission
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System 1, radiated power for direct solutions of the reference and 98 perturbed systems (thin lines), and perturbation bounds predicted by Eq. (8) (heavy lines)
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System 1, variation in normalized modal force for 98 perturbed system, ⋅ normalized modal force for reference system, error bars indicate one standard deviation
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System 1, radiated power difference for direct solutions of the reference and 98 perturbed systems (thin lines), and perturbation bounds predicted by Eq. (8) (heavy lines)
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System 3, radiated power difference for direct solutions of reference and 98 perturbed systems (thin lines), and non-participation scaled perturbation bounds predicted by Eq. (3) (heavy lines)

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